Wednesday, 15 June 2016

PLASTERING


Applying mortar on the surfaces of walls, columns, ceiling etc. to get smooth finish is termed as plastering.

Mortar used for plastering may be lime mortar, cement mortar or lime-cement mortar.

Lime mortar used lime to sand ratio of 1 : 3 or 1 : 4.

Cement mortar of 1 : 4 or 1 : 6 mix is very commonly used for plastering, richer mix being used for outer walls.

To combine the cost effectiveness of lime mortar and good quality of cement mortar many times use lime-cement mortar of proportion (cement : lime : sand) of 1 : 1 : 6 or 1 : 1 : 8 or 1 : 2 : 8.

The objective of plastering are:

1. to protect the wall from rain water and other atmospheric agencies.

2. to give smooth surface to avoid catching of dust.

3. to give good look.

Requirement of good plaster are:

1. It should adhere to the background easily.

2. It should be hard and durable.

3. It should prevent penetration by moisture

4. It should be cheap.

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